hicks



J. J. HIG KS. THERMOMETER.

(No Model.)

Patents so, 1893. FIG.! qfl fii ms "sums PU'ERS ca, vncm-umouWASNINGYQN. 0.1:

' tors and to be used with compressed divis JAMES J. HICKS, OF LONDON,ENGLAND.

THERM'OMETER.

SPECIFICATION forming part of Letters Patent No. 498,651, dated May 30,1893. Application filed January 14,1893. Serial No.- 45838] (No model.)

To all whmn it may concern:

Be it known that I, J All/[ES JOSEPH HIoKs, a subject of the Queen ofGreat Britain, residing at 8 Hatton Garden, London, in the county ofMiddlesex, England, have invented certain new and useful Improvements inThermometers, of which the following is a specification. The inventionhas for its object improvements in thermometers by the provision ofimproved means for recording the readings and thereby enabling them tobe compared from time to time with each other, or the mean or extremesof temperature of one day to be compared with those of another.

It has been proposed to combine with a thermometer one or two sealedindicator tubes filled with a suitable liquid and provided each with amovable indicator and with a scale corresponding with those of thethermometer tube. Thermometers have also been provided with movableindicators clipping the tubes and capable of being slid up and downthereon to record the temperature; and they have also been provided witha movable indicator consisting of a sliding pointer mounted on a rod oron or in a guide or guides of other character formed on or fixed to thethermometer frame. According to my invention I avoid all theseadditional extraneous indicating means, and combine additionalindicators and additional scales with the thermometertube or tubesthemselves.

In the accompanying drawings I have represented at Figure 1, myinvention applied to a self-registering maximum and minimum thermometerof the character known as a Sixs thermometer, and at Fig. 2 I haverepresented my invention applied toa simple self-registering maximumthermometer.

In carrying my invention into eltect I so arrange the dimensions ofthebulb and of the ordinary tube or tubes of the thermometer, that theordinary divisions or scale shall commence at or extend to such aposition as will leave a suflicient length of tube'or tubes to containan additional indicator or indicaions or scales corresponding with thoseof the ordipary thermometer, thus combining with PATENT OFFICE.

each thermometer tube a double set of scales and indicators.

In Fig. 1 a represents the bulb, which is filled with expansible fluid,and b b the minimum and maximum tubes respectively; the ordinarydivisions of the minimum scale 0 commence at the point marked b andthose of the maximum scale 0 terminate at the point marked b thusleaving a length of tubing 5 or b above each of such points, which isprovided with a supplemental indicator (Z or d to be used in connectionwith the compressed scales 0 0 d d are the indicators ordinarily usedWith those parts of the thermometer tubes marked 1) b. v

In Fig. 2 a is the bulb of the thermometer, b is the ordinarythermometer tube, 0' is the ordinary' scale, and d is the ordinaryindicator. Above the ordinary scale 0, commend I... ing at the pointmarked b the tube b iscontinned so as to provide a length of tubingwhich is supplied with an internal supplemental indicator 013 to beusedin connection with the compressed scale 0 f The ordinary indicator01 0rd, that is to ,I say, that which is acted upon by the mercury 7/ orother fluid, is carried, as usual, by such fluid to the maximum orminimum temper-a ture, and the additional indicator d or d of each tubeis moved by means of a magnet to i the division on the compressed scale0 or c corresponding-With that of the thermometer tube, thus retaining arecord for future comparison.

My invention is also applicable to separate minimum thermometers. 8

Having fully described my invention, What I I desire to claim and secureby Letters Patcut is--- 1. A thermometer having a tube formed with anextension, a scale in connection with 9 v said extension, and anindicatorinconnection with said extension and said scale; substantiallyas described. 7

2. In thermometers, the combination with an extended portion of theordinary tube, of 5 a supplemental recording indicator within x suchextended portion and a supplemental compressed scale to be used inconnection with such supplemental indicator, substantially as hereinshown and described and for the pur herein shown and described and forthe purpose stated. pose stated.

. 3. A thermometer having, in addition to the Witnesses:

5 ordinary bulb, tube, scale and indicator, an B. J. B. MILLS,

extended portion of tube, a recording indi- CLAUDE K. MILLS, catorWithin such extension and a compressed Patent Agents, 23 SouthamptonBuildings, scale to be used therewith, substantially as London.

@ JAS. J. HICKS.

